I found this option in my Lumia 920 in the settings of the Phone app. Can anybody tell me how it works?
I cannot find any good description in the net. Obviously, this phrase from the official page is not enough:
The International Assist option, which is enabled by default, is designed to automatically correct the most common errors that are made when dialing international numbers.
I'd like to know what rules and when are applied to the numbers I'm trying to dial.
It looks like international assist detects when the '+' symbol is needed and can tell when you are missing needed country codes (like 0044) and adds them.